type Foo = string
type Foo2 = string

fn (f Foo) + (f1 Foo2) Foo2 {
	return Foo2(f + f1)
}

fn (f Foo) * (f1 Foo) Foo {
	return Foo(f + f1)
}

fn main() {
	mut f := Foo('fg')
	f += 'fg'
	f *= Foo2('2')
	f -= Foo('fo')
	println(f)
}
